JPH0155623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a display device attached to a telephone set and used, and particularly to a display device for a telephone set that displays call time and telephone number.

[Technical background of the invention]

Conventionally, display devices attached to telephones include call time display devices, telephone number display devices, and the like. The former type of call time display device includes a device that starts counting in a counting circuit by detecting the polarity reversal of the current in the telephone line caused by the response of the called party at the time of a call using a relay, and displays this;
Alternatively, manually start counting in the counting circuit,
There are simple devices that display this.

The latter telephone number display device is a device that displays the called party's telephone number data obtained by dialing. These display devices are very convenient for the user when using the telephone.

[Problems with background technology]

However, since both of the above-mentioned display devices have a single display function, that is, only the function of displaying only the call time or the function of displaying only the telephone number, it is not possible to recognize the telephone number as well as the call time. Therefore, if only the call time can be displayed, there is an inconvenience that if the called party does not respond after a long time when the call is made, it is not possible to confirm whether or not the caller is making the wrong call. Furthermore, if only the telephone number can be displayed, the exact duration of the call can be known at the time of the call. There is a risk of making unnecessary long phone calls, which is disadvantageous in terms of billing.

In order to eliminate these inconveniences, it is possible to create a display device that simply combines the two functions of call time display function and telephone number display function, but such a display device requires two display devices. It becomes economically disadvantageous. Further, it is sufficient that the telephone number is displayed only when necessary; if the telephone number is displayed all the time, it becomes an eyesore and increases power consumption.

[Purpose of the invention]

The present invention has been made focusing on the above circumstances,
To provide a display device for a telephone that is convenient in use and economically advantageous, capable of accurately displaying call time and displaying a called party's telephone number only when necessary.

[Summary of the invention]

Therefore, the present invention achieves the above object by displaying the telephone number obtained when dialing on the display for displaying the call time, and displaying the telephone number stored in the storage means when operating the telephone number display switch. This is what I did.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, in which 1 is a telephone main body circuit, 2 and 3 are telephone lines, 4 and 5 are light emitting diodes, 6 is a switch, 7 is a dial keypad, and 8 is a dial keypad. Of these, 11 is a redial button switch, a switch that operates in conjunction with the box switch 6, 12 and 13 are phototransistors, 14 is a box switch status detection circuit,
15 is a polarity reversal detection circuit, 16 is a control circuit, 17
18 is a display, 18 is a call time counter, and 19 is a memory.

When a call is received, when a handset (not shown) is lifted, the hook switch 6 is turned on (off-hook condition), and in conjunction with this, the switch 11 is also turned on. The detection circuit 14 detects the state of this switch 11 and outputs an off-hook state detection signal to the control circuit 16. Then, the control circuit 16 causes the call time counter 18 to start counting, and causes the display 17 to display the counting contents. At the end of the call, when the handset is put down, the hook switch 6 is turned off (on-hook state) and the detection circuit 14 outputs an off-hook state detection signal to the control circuit 16. Then, the control circuit 16 stops the call time counter 18 from counting.
The count contents at the time of stop are displayed on the display 17 for a predetermined period of time.
Display for T ₃ . In this way, when a call is received, the call time is displayed.

Next, regarding the display when making a call, see Figure 2.
This will be explained with reference to FIG. FIGS. 2 and 3 are timing charts and operation explanatory diagrams at the time of transmission in this embodiment. When making a call, when the handset is lifted, the call time counter 18 starts counting in the same manner as when receiving a call. The control circuit 16 displays a blank display (no display) on the display 11 if no telephone number data is input by dialing during a predetermined time _T1 ,
After the predetermined time _T1 has elapsed, the count contents of the call time counter 18 are displayed. This display time is the elapsed time from off-hook, that is, the elapsed time until the called party answers. After that, when telephone number data is obtained by dialing (direct number dialing, speed dialing, redialing, etc.), the telephone main circuit 1 sends a selection signal based on this telephone number data to telephone lines 2 and 3. At the same time, this telephone number data is output to the control circuit 16. The control circuit 16 sequentially stores the telephone number data input digit by digit in a memory 19 which is a memory for redialing, clears the time display on the display 17, and sequentially inputs the stored telephone number data digit by digit. Display. If a polarity reversal detection signal is not output from the polarity reversal detection circuit 14 within a predetermined time period _T2 after all telephone number data is obtained by dialing (after the last digit telephone number data is obtained). , the control circuit 16 continues to display the telephone number data on the display 17 for a time _T2 , and then displays the elapsed time again. where this time T ₂
If the called party answers during the period or during the elapsed time display, the polarity of the current in the telephone lines 2, 3 is reversed by operation of the exchange. Then, if the light emitting diode 4 was turned on due to the off-hook, the light emitting diode 4 that was previously turned on is turned off due to the polarity reversal, and the light emitting diode 5 is turned on. As a result, the outputs of the phototransistors 12 and 13 change, and the polarity reversal detection circuit 15 outputs a polarity reversal detection signal based on the change in the outputs of the phototransistors 12 and 13. Based on this polarity reversal detection signal, the control circuit 16 temporarily returns the counting contents of the call time counter 18 to zero and starts counting again, and displays the call time counter 18 instead of the telephone number data displayed on the display 17. Display the counting contents.
This displayed time will be the exact call time from the called party's response.

Thereafter, when a telephone number display switch (herein referred to as redial button switch 8) (not shown) is operated during a call, the control circuit 16 displays the telephone number data stored in the memory 19 on the display 1.
7 is displayed instead of the count of the call time counter 18 for a predetermined time _T4 .

Please note that unnecessary signals are transmitted to telephone lines 2 and 3 during a call.
In order to prevent the redial button switch 8 from being sent to the control circuit 1 even if the redial button switch 8 is operated during a call.
6 does not provide the stored telephone number data to the telephone main body circuit 1. Therefore, unnecessary signals are not sent to the telephone lines 2 and 3. Further, the operation at the time of ending the call is the same as the operation at the time of receiving the call, so the description thereof will be omitted.

As described above, according to this embodiment, the display is displayed for a certain period of time after on-hook, and the impression on the user (the caller or the called party) can be increased, which is very effective in use. In addition, since the telephone number of the called party can be confirmed not only during dialing operations but also when the caller needs it, it is useful for preventing and confirming mistaken calls. Furthermore, when the handset is disconnected after the end of the call, and a state called "hanging up" occurs, the time is displayed on the display 17 forever because the hook switch 6 remains on. Therefore, the display 17 after the end of the call
By checking the display, the half-loaded state can be easily detected, and various inconveniences caused by the half-loaded state can be eliminated. Furthermore, since the memory 19 is used as a re-dial memory and the re-dial button switch 8 is used as a telephone number display switch,
A telephone with a redial function does not require a new switch or memory, making it economical.

In this embodiment, when making a call, if the predetermined time _T1 has not elapsed after off-hook, the call time counter 1
8 is not displayed, but the call time may be displayed immediately after off-hook. Furthermore, when making a call, if the called party puts down the handset first after speaking with the called party, the call time counter 18 counts by detecting the polarity reversal that occurs on the telephone lines 2 and 3 at that time. may be stopped.
In this way, more accurate call time can be displayed. Furthermore, in this embodiment, the telephone number data obtained by dialing is once stored in the memory 19 for re-dialing and then displayed on the display 17; The telephone number data may be stored in a register or the like for the display 17 and then displayed, and after the display of telephone number data during a dialing operation is completed, the telephone number data may be transferred from this register or the like to the memory 19 for redialing and stored therein.

〔Effect of the invention〕

According to the present invention, the telephone number of the called party is displayed at the time of dialing along with the call time, which is convenient for use and helps prevent wrong calls. Furthermore, when a wrong number is dialed, the called party's telephone number can be confirmed, so it can be confirmed whether the wrong call was due to a dialing error by the caller, and the caller's anxiety can be alleviated. Furthermore, various inconveniences caused by hanging the phone halfway (hanging off the receiver) can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are timing charts and operation explanatory diagrams at the time of transmission of this embodiment. 1... Telephone main circuit, 2, 3... Telephone line,
4, 5...Light emitting diode, 6...Hook switch, 7...Dial keypad, 8...Re-dial button switch, 11...Switch, 12,1
3...Phototransistor, 14...Hook switch state detection circuit, 15...Polarity reversal detection circuit,
16... Control circuit, 17... Display unit, 18... Call time counter, 19... Memory.

Claims (1)

[Claims] 1. A box switch state detection circuit that detects the connection state of a box switch connected to a telephone line, and a counting operation according to a detection signal output when the box switch state detection circuit detects the off-hook of the telephone switch. a call time counter to be started; a polarity reversal detection means for detecting a polarity reversal of the telephone line; and a polarity reversal detection means for starting a counting operation based on the detection signal in response to a reversal detection signal from the polarity reversal detection means. At least a call time counter control means for continuing counting after resetting the call time counter until an on-hook is detected by the switch state detection circuit, and a display for displaying at least the counter value of the call time counter. A display device for a telephone characterized by: